| Title: | Iron phosphides as efficient electrocatalyst for hydrogen evolution and energy conversion : abstract |
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| Authors: | ID Emin, Saim, Materials Research Laboratory, University of Nova Gorica, Ajdovscina 5270, Slovenia (Author)
ID Chouki, Takwa, Materials Research Laboratory, University of Nova Gorica, Ajdovscina 5270, Slovenia (Author) |
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| Files: |
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| Language: | English |
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| Work type: | Not categorized |
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| Typology: | 1.12 - Published Scientific Conference Contribution Abstract |
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| Organization: | UNG - University of Nova Gorica
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| Abstract: | Transition metal phosphides have been demonstrated as outstanding multifunctional catalysts in a broad range of energy conversion technologies. We developed a solvothermal synthesis approach for iron phosphide electrocatalystsusing a low-cost phosphorus precursor.The synthetic protocol allows for the preparation of a Fe2P phase at 300°C and FeP phase at 350°C. The obtained compounds were coated on conductive substrates to prepare catalysts thin films. Here, we exploited different phases of iron phosphide as counter electrodes (CEs) in dye-sensitized solar cells (DSSCs) with an I−/I3− based electrolyte [2]. The solar-to-current conversion efficiency of the solar cells assembled with the Fe2P material reached 3.96±0.06%,which is comparable to the device assembled with a platinum (Pt) CE. In addition to DSSC
applications, the iron phosphides were used as electrocatalyst for H2 evolution (Fig. 1). To enhance the catalytic activities of obtained iron phosphide particles, heat-treatments were carried out at elevated temperatures.Annealing at 500°C induced structural changes in the samples: (i) Fe2P provided a pure Fe3P phase (Fe3P−500°C) and (ii) FeP transformed into a mixture of iron phosphide phases (Fe2P/FeP−500°C). The electrocatalytic activities for H2 evolution of heat-treated catalysts were studied in 0.5 M sulfuric acid (H2SO4). The HER activities of the iron phosphide catalyst were found to be phase dependent. The lowest recorded overpotential of 110 mV at 10 mA cm−2 vs. a reversible hydrogen electrode was achieved with Fe2P/FeP−500°C catalyst. The developed procedure is an elegant approach to tune the composition of iron phosphide catalyst and control the morphology of particles. |
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| Keywords: | Iron phosphides
electrocatalyst
hydrogen evolution
energy conversion |
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| Year of publishing: | 2021 |
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| PID: | 20.500.12556/RUNG-7913 |
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| COBISS.SI-ID: | 140834819 |
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| NUK URN: | URN:SI:UNG:REP:5PGKGUSW |
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| Publication date in RUNG: | 06.02.2023 |
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| Views: | 1931 |
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| Downloads: | 0 |
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